Thread cutter blade



1935- F. E. DOUGLAS THREAD CUTTER BLADE Filed May 14, 1936 INVENTOR.

5 50576 5. flax/6AA 3.

44% 2 I ATTORNEY.

OOOOOODOOOOOOOOOOOO Patented Oct. 27, 1936 UMTE S'K'ETES malts THREADCUTTER BLADE Fredric E. Douglas, Hopedale, Mass, assignor to DraperCorporation, Hopedale, Mass., a corporation of Maine Application May 14,1936, Serial No. 79,754 5 Claims. (01. 139-303) The present inventionrelates to temple thread cutting mechanisms for looms, and has moreparticular reference to improvements in movable thread cutter bladestherefor.

Thread cutting mechanisms of the type mentioned include a stationaryledger blade carried by the loom temple and a rocking and sliding cutterblade mounted in a guideway inthe temple for cooperation with the ledgerblade. It has been proposedheretofore to make the movable cutter bladeof a body portion, which may be of cast or forged metal and thereforequite substantial, with a separate steel cutting tip secured to the bodyportion by one or more fastening devices such as rivets, the steel tipbeing relatively hard and susceptible of taking a sharp cutting edge.The construction is such that operation of the mechanism causes aconsiderable rearward pull on the cutting tip. I

Cutter blades constructed as just described have proven satisfactory inmost respects, except that the rearward pull on the cutting tip imposesso much strain on the rivets that the latter soon loosen and wear, thusrendering the cutter blade unserviceable. A number of attempts toprevent this have been made.

An object of the present invention accordingly is to provide an improvedconstruction, whereby the above-mentioned difficulties will beovercome.In accordance withthis objectlone feature of the invention resides in athread cutting temple provided with a cutter blade having a rigidmetallic body portion which is provided with a depending heel at itsforwardend and an upright shoulder, a separate cutting tip secured tothe body portion, and means for securing said tip to said body portion,said tip having an integral portion folded laterally in front of saidshoulder and in contact therewith and rearwardlyin contact with a sideface of the body, thereby relieving the securing means of the strainof alongitudinal pull on said tip. As illustrated, the cutting tip is foldedlaterally in a U-shape to conform 'to the shape of the shoulder formedon'the body portion. This U sha'ped portion is in com tact with theshoulder and the pull of the cutting tip during the thread cuttingoperation is exerted uponthe shoulder and notupon the fasteningssecuring the tip to the body portion,

With the above and other objects and features in view the inventionwill-be described in connection with the accompanying drawing andpointed out in the appended claims.

In the drawing,

Figure 1 is a view in elevation of the'rear face in a vertical plane inguideway iii.

of a temple embodying one form of thread cutting mechanism, 7

Figure 2 is a view in cross-section taken along the line 22 of Figure 1,

Figure 3 is a top plan view of the movable cutter blade shown in Figure1,

Figure 4 is a view inside elevation of the cutter blade shown in Figure3,

Figure 5 is a top plan View of another type of cutter blade, embodyingmy-invention, and

Figure 6 is a view in side elevation of the cutter blade shownin Figure5;

The temple illustrated in Figure l is provided with a supporting bar 8;a head carrying a pod iii, a cap l2 and a roll or'rolls i i; a dependingheel it by which the temple may be reciprocated; and a thread cuttingmechanism which will later be describedin' detail;- 7 j The pod Ill andthe cap 52 are provided with cooperating cut out portions constituting aguideway l8 which extends longitudinally and preferably entirely throughthe temple head. The guideway I8 is positioned in a substantiallyvertical plane and the side walls of the guideway extend insubstantially parallel planes between which the thread cutting mechanismis positioned and guided.

The thread cutting mechanism illustrated in Figures 1 to l, inclusive,comprises a flat steel ledger blade 20 and a movable cutter blade 22.The ledger blade 25) is positioned vertically in the guideway l8 at oneside of the rearward end thereof and extends upwardly into a groove orslot in the temple head where it is secured by the head of a screw 24.The rear vertical corner of the ledger blade 20 is sharpened to form acutting edge.

The movable cutter member 22 is formed with a rigid metal body portion26 which is preferably flat on both sides to fit into and to bepositioned The forward end of the body portion 26 is of usual formhaving a depending operating member 28 which is adapted to be struck bythe lay (not shown) for causing the blade 22 first to rock, to hookbehind the filling and then to slide forwardly past the cutting edge ofthe ledger blade 2?). The blade 22 is returned to its normal position byconventional form of the spring 3d.

The rearward end of the body portion of the blade 22 is provided with arearwardly extending finger 32 to which a cutting tip 3G is secured byrivets 35 and which forms a backing for the cutting tip 34. The cuttingtip M is formed of a flat resilient piece of steel as will later bedescribed. The body portion 26, the operating member 28 and the backingfinger 32 are preferably cast integrally of brass or cast iron, but theymay be otherwise constructed from strong and rigid material if sodesired.

The mechanism disclosed above is substantially the same as thatdescribed and claimed in United States Letters Patent Number 1,919,146,granted July 18, 1933, on an application filed in my name, to whichreference may be had for a more detailed description.

Referring now particularly to Figures 2, 3 and 4, it will be noted thatthe backing finger 32 is provided at its forward end with a roundedabutment or shoulder 36 formed by cutting a transverse slot in the bodyportion 26. The cutting tip 34 is of a flat piece of steel which is benttransversely in the form of a U. The U-portion fits against the shoulder36 and prevents relative movement between the cutting tip 34 and thefinger 32 when the movable cutter member 22 is moved forwardly to severa filling thread. It is apparent that this construction prevents arearward pull on the rivets during the cutting operation, and,consequently, these rivets do not readily loosen and wear. In otherwords, the pull of the cutting operation is exerted upon the shoulder orabutment 36 and not upon the rivets.

As shown in Figure 3, the cutting tip 34 extends rearwardly along thebacking finger 32. The rearward end of the tip 34 is provided with adepending cutting portion having a sharpened edge 38 which cooperateswith the ledger blade 20. The rearward end of the tip 34, as shown inFigures 1, 2 and 3 is bent slightly away from the backing finger 32which insures that the cutting tip 34 will at all times cooperate withthe ledger blade 20. The temple is provided with means for adjusting therelative lateral positions of the movable cutter blade 22 and the ledgerblade 20. As shown in Figure l, a resilient metal strip 40 is positionedin the guideway l8 on the side opposite to the ledger blade 20. Anadjusting screw 42 bears against the lower end of the strip 40 and byturning the adjusting screw 42 the strip 40 is bent, which moves themovable cutter blade 22 toward the ledger blade 2!].

In Figures 5 and 6 there is disclosed another form of cutting bladeembodying my invention. In this modification, the movable cutting blade44 having a depending operating member 45 is arranged to be struck bythe lay for causing the blade 44 first to rock the rearward end of theblade downwardly and then to slide the blade forwardly to sever afilling thread. After the severing operation is completed, the blade 44may be returned to its initial position by a spring of any usual type.The cutting blade 44 is provided with a rearwardly extending portion 50.The portion 50 is provided with a rounded upwardly extending abutment orshoulder 52 the purpose of which will later be disclosed.

As shown in Figure 5, a fiat resilient piece of steel is folded uponitself to form a U-shaped cutting tip 54. This U-shaped cutting tip 54is arranged to fit against the shoulder 52 and the cutting tip 54 isrigidly secured to the movable cutting blade by a plurality of rivets55. As in the form shown in Figures 1 to 4, inclusive, there is norearward pull on the rivets 55, or other fastenings used, during thecutting or severing operation, the pull being exerted on the shoulder52.

The cutting tip 54 is provided with a pair of cutting members 56, 58which are each provided with cutting edges 60. These cutting edges areparallel to each other and lie in substantially the same plane. As shownin Figure 5, the movable cutter blade 44 extends only to about the midportion of the cutting tip 54, and does not back up the entire length ofthe cutting tip 54. The cutting members 56, 58 are bent toward eachother as shown in Figure 5. A stationary cutter (not shown) of any usualtype is secured to the temple and is inserted between the cutting tipsand cooperates with the cutting edges 60 to sever a filling thread.

Reviewing briefly, the embodiment of the invention shown in Figures 1 to4, inclusive, discloses a cutting tip 34 which is secured to the movablecutter blade 22 by rivets or other fastenings and because of theU-shaped portion of the cutting tip 34 any pull on the cutting tip isexerted upon the shoulder or abutment 36 and not upon the rivets. In thesame manner, in the type of cutting tip 54 shown in Figures 5 and 6, therearward pull of the cutting tip 54 is exerted upon the shoulder 52 andnot upon the rivets securing the tip 54 to the movable cutting blade 44.

Having thus described the preferred embodiments of my invention, Iclaim:

1. As an article of manufacture, a cutter blade for thread cuttingtemples; said blade having a rigid metallic body portion, said bodyhaving a depending heel at its forward end and an upright shoulderforwardly of its rearward end, a separate steel cutting tip, and afastening device securing said tip to one side face of said bodyportion, said tip having an integral portion folded laterally in frontof said shoulder in contact therewith and rearwardly in contact with aside face of the body to relieve said fastening device of the strain ofa longitudinal pull on said tip.

2. As an article of manufacture, a cutter blade for thread cuttingtemples; said blade having an elongated rigid metal body portion, saidbody being provided with a depending heel at its forward end and ashoulder intermediate its ends, said shoulder having a substantiallyvertical forward edge, a separate fiat steel cutting tip, and afastening device securing said tip to one side face of said body portionrearwardly of said shoulder, the forward end of said tip being foldedabout said edge in contact therewith and rearwardly in contact with aside face of the body to relieve said fastening device of the strain ofa rearward pull on said cutting tip.

3. As an article of manufacture, a cutter blade for thread cuttingtemples; said blade having an elongated rigid metal body portion, saidbody being provided with a depending heel at its forward end and ashoulder intermediate its ends, said shoulder having a substantiallyvertical forward edge, a separate steel cutting tip folded about saidedge of said shoulder to provide parallel integrally joined portions incontact with opposite side faces of said body portion, and a fasteningdevice securing both of said portions of said tip to said body portionat a point rearwardly of said edge.

4. As an article of manufacture, a cutter blade for thread cuttingtemples; said blade having an elongated rigid metal body portion, saidbody being provided with a depending heel at its forward end and ashoulder intermediate its ends, said shoulder having a substantiallyvertical forward edge, a separate flat steel cutting tip comprisingparallel side portions in contact with opposite faces of said bodyportion, said side portions being joined at their forward ends by anintegral connecting portion which engages about said edge, at

least one of said side portions having at its rearward end a downwardlyextending cutting edge, and a rivet securing said side portions to saidbody portion at a point rearwardly of said edge.

5. As an article of manufacture, a cutter blade for thread cuttingtemples; said blade being comprised of a rigid metallic body portionhaving at its forward end a depending heel and at its rearward end arearwardly extending backing finger, said body portion having a slotextending downwardly from its upper edge at a point forwardly of saidfinger, a resilient steel cutting tip having parallel fiat portions incontact with opposite side faces of said body portion, said fiatportions being connected at their forward ends by an integral connectingportion which is positioned in said slot in contact with the rearwardedge thereof, one of said fiat portions having at its rearward end adownwardly extending cutting edge which is spaced slightly away from therearward end of said backing finger, and a rivet securing said flatportions of said tip to said body portion at a point 10

